Linksys EtherFast Cable/DSL VPN Router w/ 4-Port 10/100 Switch. Authentication method: MD5, SHA, Security algorithms supported: MD5, Filtering: NAT, PPPoE, IP Filter, MAC. Certification: FCC Class B, CE Mark Commercial. Operating temperature range (T-T): 0 - 45 °C, Storage temperature range (T-T): -20 - 70 °C, Operating relative humidity range: 0 - 90 %. Weight: 0.36 kg. Compatible operating systems: Windows 95, 98, 2000, XP, NT, Windows ME.